No, not at all, to both questions.
By no means does it exist in every known species on the planet. As for evolution, an individual who doesn't engage in whatever that species does to reproduce, doesn't pass on his/her/its genes. The reason why doesn't matter.
Right. Homosexually occurs in MOST of the species on the planet, with mainly incest being excluded, but not excluded entirely. But, mammals and birds commit homosexual acts all the time.
Yeah we probably have disrupted the flow of evolution of many species. But, that's not unusual in history. In fact, it naturally occurs all of the time. I suppose that you could argue that we are disproportionately affecting other species when compared to, um, other species. But, again, you could argue that even THAT in and of itself is the natural progression of evolution. The thing that should concern us is; are we affecting it so much that it is beginning to upset the ecological cycle of our planet in general? What are the consequences for such changes?
I don't know how that would relate to "evolutionary peak"s though (by "peak", I presume you are referring to that in a purely linear fashion, like humans to chimps, because evolutionary peaks are supposed to occur all the time in every species that we see today). Certainly, if history is anything to go by, we've got some way to go yet. The only major difference between us and previous forms of evolution is that we are "self-aware" and occasionally, rational beings. I'm not an evolutionary scientist, but I'd be surprised if this is all nature has to offer.
As for homosexuality, certainly humans seem to have overcome that issue, with many alternative options available to same-sex couples to help contribute to the population. As for other species, I would presume that the individual animals in question would end their genetic history with that generation (due to their unsuccessful completion of the reproductive process). But, much of what I've written here I've just pulled from the recesses of my mind and things I've picked up over the years, so feel free to contradict me on any of those points if you've got sources or know-how.
But...what we're doing to the evolutionary chain ISN'T natural. It cannot be taken as simply a natural disaster, because we've obtained our position through unnatural means, and the damage we've done as humans is FAR greater than any disaster that has ever occurred unless you consider the global flood. (which, btw, if it happened would have erased and corrupted the time tables for everything that came during or before it, which would mean, if it did happen, we would have absolutely no way of accurately determining the age of our planet)
Plus, you have all the partial eradications, like the Grey Wolf in North America. We erased it from the land, which did a LOT of damage to our eco-system. Sure, we're trying to get it back, but it's not really going all that well 'cause people are idiots.
And without the wolf, forests got ravished by deer, cougar and coyote populations exploded. No wolves probably helped the wild bore and other evasive species flourish in America. Evolution implies that, for it to work, a species would have to have a reason to evolve; a weakness or a predator to overcome. But, without that motivation; that ingredient, if you will, wouldn't the Evolutionary process cease to exist?
Also, human beings have demonstrated that they have the power to essentially control what lives and what survives. We could even wipe out ourselves if we so desired. (It's harder to do with non-lethal methods and big cities, but that does not mean we do not have the power). To me, because we humans possess that power, Evolution, if it did exist at one point, has stopped. As soon as we committed our first act of genocide, Evolution would have halted. Sure, nature would have done it's best to correct our power, but we are just too powerful.
No one can say for sure how this earth or the creatures on it got to where they are today because no one alive was there when it started. Not even prophets can see that far in the past. But, it has been stated many many many times in the past that human beings are powerful. Even in the Bible, God mentions that we are like gods (Gen. 3:22) and we have such great power that not even heaven is beyond our reach. (Gen 11:6) (And didn't the Greek gods eventually fall victim to the power of mortal men?)
There all sorts of things that we have done that would have decimated the flow of Evolution. Domestic dogs, domestic cats, cows, modern chickens and turkeys (which, by the way, can no longer breed on their own)....My point isn't that we've simply disrupted evolution, we've completely stopped it for MANY species. We, in our current form, would be the ultimate evolutionary specie because of our power. If we can stop the evolutionary chain of events, if we are the fittest specie, then wouldn't "man-beasts" be the ultimate end to evolution. Then every specie would be on level ground. There would be no fittest specie anymore. (By the way, if you consider we are at our Evolutionary fittest point, then that means we would have arrived at this point BEFORE everything else, which would imply that the Evolutionary flow was out of balance from the beginning...and maintain it's out of balance ways through several mass extinctions if you believe in those. And correct me if I'm wrong, but that isn't how Evolution is supposed to work. I'm starting to see why Darwin himself had issues with applying his "theory" on much larger terms, 'cause when you REALLY start to think about it, it doesn't really...work. 'Cause humans don't entirely fit.)
Now...if one were to say humans were the caretakers of Evolution, then that makes more sense....but wait...weren't we called "caretakers of the land" somewhere already?
Oh yeah:
"And God blessed them. And God said to them, "Be fruitful and multiply and fill the earth and subdue it and have dominion over the fish of the sea and over the birds of the heavens and over every living thing that moves on the earth." -- Genesis 1:28.
EDIT: P. S. I'm not saying the Bible is right or literal or anything like that. I'm just saying human beings are powerful enough that even the writers of the Bible acknowledged our power. As for the homosexuality thing....if you want to go with the Evolutionary theory, then it would simply be nature...which definitely isn't something most Christians want to acknowledge. As for me, I have no idea why homosexuality exists. A lot of naturalists believe it shows an extremely close bond between members of the same sex..."closer than family" if you will. And that maybe what it was, at one point, with humans, as well. But, as with all animals, we humans are pretty darn unpredictable and I think to answer the question as to why homosexuality exists in so many species, we would have to ask them, but, if we did ask them, we'd better be prepared for every specie to give us completely different answers.
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